The season one house is a real location at 1120 Westchester Place in Los Angeles known as the Rosenheim Mansion. It was built in 1908 by architect Alfred Rosenheim as his own residence; Rosenheim was one of LA's most influential architects during the early 1900s. The house scenes in the pilot episode of "American Horror Story" were filmed on location at the Rosenheim Mansion, and then some of the house's interiors were replicated on a set. Exteriors continue to be filmed there on location.